The oversized oatmeal strip is cut at 19". Once you have completed the block it will be trimmed down to 18 1/2" x 18 1/2". Check to see if you sewed the oatmeal strip in the correct position at the top of the block. That might make a difference with your final numbers.
Hi, This strip is cut oversize anyway, the house block is supposed to be 18 x 18 finished, so, measuring 18-1/2 x 18-1/2 from edge to edge, before adding the nine-patch border.
